Before she knew it, Kati had been reincarnated as a baby. While she is confused by her sudden reincarnation into another world, she is taken in by Edvard, a cool and talented young prime minister. She was happy to see her handsome dad, but it was revealed that she had memories of her previous life! After learning Kati's secret, Edvard gives the baby some tough training in order to be able to use Kati's knowledge and protect Kati herself. As she continues her special training thinking, "This devil!" Kati begins to work as Edvard's spy...?! Move at high speed and do intelligence activities while being loved as a cute baby!